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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Some builtin intrinsics that are not constexpr but could be"
href="https://bugs.llvm.org/show_bug.cgi?id=47249">47249</a>
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<th>Summary</th>
<td>Some builtin intrinsics that are not constexpr but could be
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>llvm-dev@redking.me.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>erich.keane@intel.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>This isn't exhaustive, but all are low hanging fruit:
bit twiddling:
__builtin_bitreverse8
__builtin_bitreverse16
__builtin_bitreverse32
__builtin_bitreverse64
__builtin_rotateleft8
__builtin_rotateleft16
__builtin_rotateleft32
__builtin_rotateleft64
__builtin_rotateright8
__builtin_rotateright16
__builtin_rotateright32
__builtin_rotateright64
vectors:
__builtin_convertvector
__builtin_shufflevector
-fms-extensions variants:
__lzcnt16
__lzcnt
__lzcnt64
__popcnt16
__popcnt
__popcnt64
_rotl8
_rotl16
_rotl
_rotl64
_lrotl
_rotr8
_rotr16
_rotr
_rotr64
_lrotr</pre>
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</p>
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